As shown in [1]}, the two relations (REF ) and (REF ), together with suitable assumptions about boundedness and analyticity in \({\bar{h}}_1\)  and \({\bar{h}}_2\) , uniquely fix the primary OPE coefficient to take the form
\(C^{(0)}_p ({\bar{h}}_1, {\bar{h}}_2)= \gamma _{p}^{s_1, s_2} B(2 {\bar{h}}_1+p, 2 {\bar{h}}_2+p).\) 
